On the first day of learning MATLAB, sort out some functions you see. 1. Sin, cos, tan trigonometric functions in matlab. 2.abs function. 3. vpa function. 4. disp function. 5. class function. 6. logical function.

1. Sin, cos, tan trigonometric functions in matlab.
In MATLAB, the trigonometric functions sin, cos, and tan are all in radians. For example, the number entered in parentheses in sin() defaults to radians. If you want to input the angle value, you can use the following two methods: a. Use sind(), cosd(), tand() functions, these three functions are already designed functions in the matlab program, you can use them directly, in parentheses Just input the angle value for the median solution; b. Use the deg2rad() function to convert the degree value you input into a radian value. This function is also a function that has been pre-designed in matlab and can be used directly, such as sin(deg2rad (30)), the 30 entered here is the degree value.
2.abs function.
(Note: The x that appears below all represent a variable) abs(x) means to find the absolute value of the x variable. What needs to be added here is that this x can be a matrix, and the effect of using this function on the matrix is also right Each element in the matrix finds its absolute value.
3. vpa function.
The effect of the vpa function vpa(x,64) is to set the precision of x. There are two positions in the brackets. The former position is the object to be set for precision, and the latter position is the number of digits of precision to be set. Here The 64 is a random one I wrote, and it can also be 10, 20, 33 and other numbers.
4. disp function.
It is used to output the content of variables, several of which can be output at the same time, and separated by commas in the case of outputting several. Syntax format: diap(). For example, to output "what category does R1 belong to? Answer: sym", use the statement "disp(['What category does R1 belong to? Answer:', class(R1)])", which consists of two parts 5
. class function.
It is used to determine the category of the object,
6. logical function.
Turn the numerical data into a logical value (the logical value is only two 0 and 1) logical(x), if x is a non-zero number, the result of this function is to become a logical value 1, if x is 0, This function turns the value 0 into a logical value 0.
OK, that's all for today, the next update is a problem that is often encountered in numerical analysis and matlab: numerical solution and analytical solution.
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